The document describes the basic BGP configuration of routers R1, R2, and ISPs Airtel, Reliance, and Vodafone. It defines the interfaces of each router and ISP with IP addresses. It also outlines the BGP configuration of each entity with AS numbers, neighbor definitions, and network advertisements. Troubleshooting commands like show ip route, show ip bgp summary, and show ip bgp neighbor are listed.

1. Basic BGP Configuration
www.netprotocolxpert.in

3. R2 interfaces Configuration:-
 interface FastEthernet0/0
description CONNECTED WITH SW1
 ip address 192.192.12.2 255.255.255.0
 no shut
 exit

4. R1 interfaces Configuration:-
 interface FastEthernet0/0
description CONNECTED WITH SW1
 ip address 192.192.12.1 255.255.255.0
 no shut
 exit
 interface Serial0/0
description CONNECTED WITH R1
 ip address 192.192.1.2 255.255.255.252
 clock rate 2000000
 no shut
 exit
 interface Serial0/1
description CONNECTED WITH RELIANCE_ISP
 ip address 192.192.1.6 255.255.255.252
 clock rate 2000000
 no shut
 exit

5. Airtel_ISP Interfaces Configuration:-
 interface Serial0/0
description CONNECTED WITH R1
 ip address 192.192.1.1 255.255.255.252
 clock rate 64000
 no shut
 exit
 interface Serial0/1
description CONNECTED WITH VODAFONE_ISP
 ip address 200.200.1.5 255.255.255.252
 clock rate 2000000
 no shut
 exit

6. Reliance_ISP interface Configuration:-
 interface Serial0/0
description CONNECTED WITH VODAFONE_ISP
 ip address 200.200.1.1 255.255.255.252
 clock rate 2000000
 no shut
 exit
 interface Serial0/1
description CONNECTED WITH R1
 ip address 192.192.1.5 255.255.255.252
 clock rate 2000000
 no shut
 exit

7. Vodafone_ISP interfaces Configuration:-
 interface Serial0/0
description CONNECTED WITH RELIANCE_ISP
 ip address 200.200.1.2 255.255.255.252
 clock rate 2000000
 no shut
 exit
 interface Serial0/1
description CONNECTED WITH AIRTEL_ISP
 ip address 200.200.1.6 255.255.255.252
 clock rate 2000000
 no shut
 exit

8. Terms:-
 {Remote-as:-Specify a BGP neighbor Autonomous No.
{AS No}
 BGP Synchronization:- Do not use or advertise a route
learned via IBGP until the same route has been learned
from the internal routing protocol
 BGP next-hop-processing:-
◦ For EBGP peers:- change next hop address on advertised routes
◦ For IBGP peers:-do not change next hop address on advertise
routes

9. R2 BGP Configuration:-
 R1(config)# router bgp 65001
 no synchronization
 bgp router-id 2.2.2.2
 network 192.192.12.0 mask 255.255.255.0
 neighbor 192.192.12.1 remote-as 65001
 neighbor 192.192.12.1 description R1
 no auto-summary

10. R1 BGP Configuration:-
 R2(config)#router bgp 65001
 no synchronization
 bgp router-id 1.1.1.1
 network 192.192.1.0 mask 255.255.255.252
 network 192.192.1.4 mask 255.255.255.252
 neighbor 192.192.1.1 remote-as 65002
 neighbor 192.192.1.1 description AIRTEL_ISP
 neighbor 192.192.1.5 remote-as 65004
 neighbor 192.192.1.5 description RELIANCE_ISP
 neighbor 192.192.12.2 remote-as 65001
 neighbor 192.192.12.2 description R2
 no auto-summary

11. Airtel_ISP BGP Configuration:-
 Airtel_ISP(config)#router bgp 65002
 no synchronization
 bgp router-id 3.3.3.3
 network 192.192.1.0 mask 255.255.255.252
 network 200.200.1.4 mask 255.255.255.252
 neighbor 192.192.1.2 remote-as 65001
 neighbor 192.192.1.2 description R1
 neighbor 200.200.1.6 remote-as 65003
 neighbor 200.200.1.6 description VODAFONE_ISP
 no auto-summary

12. Reliance_ISP Configuration:-
 Reliance_ISP (config)#router bgp 65004
 no synchronization
 bgp router-id 4.4.4.4
 network 192.192.1.4 mask 255.255.255.252
 network 200.200.1.0 mask 255.255.255.252
 neighbor 192.192.1.6 remote-as 65001
 neighbor 192.192.1.6 description R1
 neighbor 200.200.1.2 remote-as 65003
 neighbor 200.200.1.2 description VODAFONE_ISP
 no auto-summary

13. Vodafone_ISP {BGP} Configuration:-
 Vodafone_ISP (config)#router bgp 65003
 no synchronization
 bgp router-id 5.5.5.5
 network 200.200.1.0 mask 255.255.255.252
 network 200.200.1.4 mask 255.255.255.252
 neighbor 200.200.1.1 remote-as 65004
 neighbor 200.200.1.1 description RELIANCE_ISP
 neighbor 200.200.1.5 remote-as 65002
 neighbor 200.200.1.5 description AIRTEL_ISP
 no auto-summary

14. Troubleshooting & Verification Commands:-
 show ip route
 show ip interface brief
 show ip bgp summary
 show ip bgp
 show ip bgp neighbor